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A student considers the number 0.101001000100001... to be rational because its decimal expansion consists of digits. Which is the correct evaluation of this conclusion?

Answer and explanation

Correct answer: It is an irrational number

The number is irrational because its decimal expansion is non-terminating and does not repeat in a fixed pattern; the number of zeros between successive 1s keeps increasing. Merely being written with digits does not make a number rational. A rational number has a terminating or recurring decimal expansion. Exam tip: classify an infinite non-repeating decimal as irrational.

Related tags

Real NumbersRational NumbersIrrational NumbersDecimal ExpansionNumber ClassificationNumber SystemsMathematicsClass 9 Mcq

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